Cutter-head



(No Model.)

A. V. GROSS.

CUTTER HEAD.

Patented Apr. 17,1883.

INVENTOR ATTORNEYS.

N. PETERS. PhotcrLithognpher, Washingon. n c.

" NITED STATES PATENT OFFICE.

ABRAHAM V. GROSS, OF VILLIAMSPORT, PENNSYLVANIA.

CUTTER-H EAD.

SPECIFICATION forming part of Letters Patent No. 275,890, dated April 1'7, 1883.

Application filed January 3, 1883. (No model.)-

To all whom it may concern:

Be it known that I, ABRAHAM V. (Ross, of Williamsport, Lycoming county, Pennsylvania, have invented a new and useful Improvement in Cutter Heads and Knives for Rotary Planers, of which the following is afull, clear, and exact description.

My invention relates to improvements in the cutter heads and knives of rotary planers; and it consists in the peculiar construction and arrangement of the parts, as hereinafter more fully set forth.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 represents a partially sectional end view of the cutter-head of arotary planer with my improved cutter or cutters and means of adjusting and securin g the same applied. Fig 2 is a top or face view of the same with one of the knife-holdin g taps or back plates removed, and Fig. 3 an under or inner face view of one of said plates detached.

The cutter-head A, which may have any number of knife-carrying wings or faces I), is represented as constructed for and carrying knives or cutters which have their cuttingedges arranged so as to cut at all points simultaneously throughout their length, as in what are known as straight planers, but said parts may be constructed and arranged to give an oblique or gradual out, as in various kinds of diagonal planers. As hereinbefore observed, each wing b may have any number of knives or cutters of different patterns arranged side by side on them. For the purposes of illustration, each wing I) is here shown as carrying two straight-edged knives, B B, and an intermediate beadin g cutter or knife, 0, arranged so that each succeeding row of cutters breaks joint with the preceding row thereof by making the knives B B of different lengths on their cutting-edges and arranging a long knife in the one row in advance of in rear of a short knife in the next or a following row, whereby ridges on the cut surface are prevented, and the knives are prevented from getting out of balance. If desired, there may be any number of cutter-heads A thus armed with knives or cutters-arranged upon the same shaft, and the knives may be of any desired length or size. In some cases each wing b may carry only a single knife or cutter. Each of said knives or cutters B B or O, which may be of one-eighth of an inch thickness, (more or less,') has formed in its back a series of V or othersuitably shaped parallel grooves, 0, across or along it, and is held in its place on the wing b of the rotary head which carries it by a steel or other suitable back or lapping plate, D, that is constructed on its inner face with a rib or tooth, d, corresponding to either groove 0, and interlocking therewith to hold the several cutters on the same wing in position. These plates D are secured to the cutter-head A by a screw. 0, arranged to pass through an oblong slot, f, in each of said plates, which is in transverse relation to the grooves c and rib d, and in rear of the knives or cutters B B 0, whereby the lapping plate D may be adjusted forward or backward, as required, to meet wear or other changes of the cutters.

By means of the grooves c in the backs of the knives, and the engaging rib d in the inner face of either lapping plate D, the knives or cutters may be adjusted in or out, with their cutting-edges always in parallel relation with the cutter-head. Furthermore, said knives or cutters are made with opposite cuttingedges, 9, whereby the knives, when worn too much on their one edge, may be reversed or turned end for end, thus utilizing the knife to its fullest extent.

By this construction and arrangement of parts not only may the knives be reversed, as described, and be set in or out,as required, by making the rib d of the plate D to engage with either groove 0 in the backs of the knives, but where a heading cutter, O, is used the knives may be moved longitudinally on the cutter head and in different positions in or out relatively to the lapping plates D, as the molding or cut to be made requires. These adjustments are not provided for in the usual solid cutter-head. All the sharpening of the knives may be done by filing instead of grinding, and the knives may be almost completely used upbefore discarding them as worn out, the reversing of the knives,in addition to their adjustment back ward orforward by the grooves c and the rib (1, giving an enlarged advantagein this respect. Either knife or cutter may be so adj usted orreversedindependently of the other.

Having thus described my invention, Iclaim holding-plates D, each provided with a. rib, d, as new and desire to secnrebyLetters Paten t and slot f, and screw-bolts e, substantially as 10 The combination, with the cutter-laced A, described, and for the purposes set forth. provided with wings b, of the reversi 1e cut- 5 ters B B 0, having parallel grooves con their ABRAHAM CROSS backs, and their cutting-edges of different Witnesses: lengths, so that the cutters on one wing may FRANK H. MCCORMICK,

overlap the joints on the succeeding wing, JOHN HENEGAN. 

